Quarterly report pursuant to Section 13 or 15(d)

STOCK-BASED COMPENSATION - Additional Information (Details)

v3.19.2
STOCK-BASED COMPENSATION - Additional Information (Details) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation, Allocation and Classification in Financial Statements [Abstract]        
Weighted-average Exercise price $ 6.86 $ 16.27 $ 6.84 $ 14.38
Weighted-average Grant date fair value $ 5.39 $ 12.87 $ 5.37 $ 11.36
Stock Options        
Share-based Compensation, Allocation and Classification in Financial Statements [Abstract]        
Options granted 1,183,890 224,800 1,384,890 869,800